Anti-reflux catheter

Abstract

The utility model discloses an anti -backflow catheter relates to the field of catheter, to solve the pressure difference of inside and outside in prior art, the diaphragm may not be completely closed under the pressure effect, make a small amount of contrast medium still backflow problem. The catheter body outside one side is provided with the catheter seat, and the one side of catheter seat is close to the catheter body and forms the tightening part, and the inside intermediate integral connection of catheter seat has the fixed ring, and the one end of catheter body is fixed in the fixed ring, the inside of catheter seat is provided with the mobile adjusting spare, and the mobile adjusting spare includes mobile adjusting pipe, and the upper and lower end of mobile adjusting pipe is provided with the arc slot, the inside of catheter seat is provided with the metal spring piece along the upper and lower end symmetry of mobile adjusting pipe, and the metal spring piece includes extrusion deformation part, and the extrusion deformation part passes through arc slot and extrudes the upper and lower end of catheter body.

Description

Technical Field

[0001] This utility model relates to the field of catheters, specifically an anti-backflow catheter. Background Technology

[0002] In the medical system, hysterosalpingography (HSG) is an important gynecological examination used to assess the patency, morphology, and function of the fallopian tubes. It is crucial for diagnosing gynecological conditions such as infertility, fallopian tube obstruction, and hydrosalpinx. This examination typically involves injecting a contrast agent into the uterine cavity and using X-ray or ultrasound imaging to observe the flow of the contrast agent within the fallopian tubes, thereby determining their condition. A significant problem with traditional HSG is the backflow of the contrast agent. Due to the pressure difference between the uterine cavity and the fallopian tubes, some of the contrast agent may flow back into the cervix or vagina when injected into the uterine cavity. This not only reduces the imaging effect and affects diagnostic accuracy but may also cause discomfort and potential risks to the patient, such as infection and pain.

[0003] To address this issue, anti-backflow catheters have been developed. These catheters are designed to effectively prevent the backflow of contrast agents during injection through innovative structural design, thereby improving imaging results, reducing patient discomfort and risks, and ensuring patient safety and comfort.

[0004] For example, the Chinese authorized patent with publication number CN 106334250 A (Anti-backflow device for angiography catheter) includes an outer tube and an anti-backflow component. The anti-backflow component includes a cannula seat, a connector, a flap, and a flap base. The outer tube is inserted through one end of the cannula seat. The connector is detachably connected to the cannula seat. The flap is placed in the flap base, and the flap base is detachably connected to the bottom of the connector. The flap includes a main body, an upper flap protrusion, and a lower flap protrusion. The upper flap protrusion has an opening that divides the upper flap protrusion into two flaps. The lower flap protrusion has a groove in the middle, and a circular hole in the center of the groove.

[0005] While the aforementioned existing technology can prevent the contrast agent from flowing back and leaking, and facilitate examination, there is a pressure difference between the inside and outside. Under pressure, the membrane valve may not be able to close completely, causing a small amount of contrast agent to still flow back. Utility Model Content

[0006] The purpose of this invention is to provide an anti-backflow catheter to solve the problem mentioned in the background art, where there is a pressure difference between the inside and outside, and the membrane valve may not be able to close completely under pressure, resulting in a small amount of contrast agent still flowing back.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-backflow conduit, comprising a conduit body, a conduit seat provided on one side of the outer side of the conduit body, a tightening portion formed on the side of the conduit seat near the conduit body, a fixing ring integrally connected in the middle of the conduit seat, and one end of the conduit body fixed in the fixing ring; a movable adjustment component provided inside the conduit seat, the movable adjustment component comprising a movable adjustment tube, the movable adjustment tube having arc-shaped slots at its upper and lower ends; metal springs symmetrically arranged inside the conduit seat along the upper and lower ends of the movable adjustment tube, the metal springs comprising a compression deformation portion, the compression deformation portion passing through the arc-shaped slots to compress the upper and lower ends of the conduit body.

[0008] Preferably, the metal spring sheet further includes an arc-shaped fixing part and a straight connecting part, the arc-shaped fixing part, the extrusion deformation part and the straight connecting part are arranged sequentially and integrally formed; the upper and lower ends of the conduit body are fixed with fixing posts inside the conduit body near the conduit body, the arc-shaped fixing part is fixed to the outside of the fixing posts, and the conduit body is fixed with limit posts on both sides of the arc-shaped slot inside the conduit body, the two limit posts are a group and fit against both sides of the extrusion deformation part, and the straight connecting part is fixed to the movable adjustment tube by a fixing block.

[0009] Preferably, the catheter seat is symmetrically provided with driving adjustment components at the upper and lower ends along the outer side of the fixing ring. The driving adjustment components include a sliding column, and the sliding column has vertical limiting grooves at the upper and lower ends. A vertical limiting rod is fixed in the catheter seat at the position corresponding to the vertical limiting groove. The sliding column slides along the vertical limiting rod. An infusion needle squeezing plate is fixed at the inner end of the sliding column. An inclined plate is integrally connected to the side of the infusion needle squeezing plate away from the catheter body.

[0010] Preferably, an internal fixation tube is fixed inside the catheter seat near one end of the catheter body. An annular limiting groove is formed inside the internal fixation tube. One end of the movable adjustment tube extends into the annular limiting groove and slides along the annular limiting groove. A connecting rod is fixed in an annular array at the other end of the movable adjustment tube. Multiple connecting rods pass through the fixing ring and are fixed to the connecting ring. The connecting rods slide along the fixing ring. Connecting adjustment blocks are symmetrically fixed at the upper and lower ends of the outer side of the connecting ring.

[0011] Preferably, the inner end face of the connecting adjustment block forms a first inclined adjustment surface, the connecting adjustment block is provided with a through sliding groove running vertically through it, the vertical limiting rod slides along the through sliding groove on the connecting adjustment block, the sliding column is provided with an inner slot at a position corresponding to the connecting adjustment block, and the inner slot and the contact surface with the first inclined adjustment surface form a second inclined adjustment surface.

[0012] Preferably, a soft tip is fixed to one end of the catheter body away from the catheter seat, and an elastic valve is fixed to the outer side of the soft tip.

[0013] Preferably, an annular support plate is integrally connected to the end of the catheter seat away from the catheter body. A converging channel is formed inside the annular support plate, and the opening diameter of the converging channel gradually decreases towards the catheter body. Annular anti-slip patterns are fixedly arranged on the inner surface of the catheter seat along the outer side of the annular support plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) In this utility model, by setting a metal spring, before the contrast agent is introduced, the extruded and deformed part of the metal spring can fit tightly against the catheter body; after the contrast agent is introduced, the extruded and deformed part of the metal spring continues to fit tightly against the catheter body through the action of the metal spring, effectively preventing the contrast agent from flowing back. Since the metal spring compresses the catheter body, even if there is a pressure difference between the inside and outside, the presence of the metal spring can better resist the pressure action, solving the problem that currently, when there is a pressure difference between the inside and outside, the membrane valve may not be able to close completely under pressure, causing a small amount of contrast agent to still flow back.

[0016] (2) In this utility model, the elastic valve can automatically contract and seal the inlet of the catheter body after the contrast agent is infused, without the need for manual operation, reducing the risk of infection and improving the safety and efficiency of the operation. The elastic valve performs the first step of closure, which can block the outflow of contrast agent during the withdrawal of the contrast agent infusion needle. The anti-backflow structure of the two works together to make the anti-backflow effect better.

[0017] (3) In this utility model, the contrast agent infusion needle will reach between the two inclined plates along the convergence channel, squeezing the infusion needle squeezing plate outward. Through the cooperation of the sliding column and the connecting adjustment block structure, the connecting adjustment block is pushed to move away from the catheter body, so that the opening of the contrast agent infusion needle will not poke the catheter body when placed, avoiding damage to the catheter body. Moreover, after the contrast agent infusion needle is withdrawn, the metal spring is reset, the squeezing deformation part is reset and re-squeezes the catheter body, thus achieving the anti-backflow function. No additional operation is required in this operation, making the operation simpler. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an anti-backflow duct from the main view of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of an anti-backflow duct from a side view of this utility model;

[0020] Figure 3 This is a front view of an anti-backflow conduit according to the present invention;

[0021] Figure 4 This is a cross-sectional view at point AA of an anti-backflow conduit according to this utility model;

[0022] Figure 5 This is an enlarged view of the structure at point B of an anti-backflow conduit according to this utility model;

[0023] Figure 6 This is a schematic diagram of the moving adjustment component of an anti-backflow duct according to the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of a drive adjustment component for an anti-backflow duct according to the present invention.

[0025] In the diagram: 1. Catheter body; 2. Soft tip; 3. Elastic valve; 4. Catheter seat; 5. Tightening part; 6. Internal fixation tube; 7. Annular limiting groove; 8. Fixing ring; 9. Vertical limiting rod; 10. Annular support plate; 11. Convergence channel; 12. Annular anti-slip texture; 13. Fixing post; 14. Limiting post; 15. Moving adjustment component; 16. Moving adjustment tube; 17. Arc-shaped slot; 18. Connecting rod; 19. Connecting ring; 20. Connecting adjustment block; 21. First inclined adjustment surface; 22. Through sliding groove; 23. Drive adjustment component; 24. Sliding column; 25. Vertical limiting groove; 26. Inner slot; 27. Second inclined adjustment surface; 28. Infusion needle squeezing plate; 29. ​​Inclined plate; 30. Metal spring; 31. Arc-shaped fixing part; 32. Squeezing deformation part; 33. Straight connecting part; 34. Fixing block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Please see Figures 1-7 This utility model provides an embodiment of an anti-backflow conduit, comprising a conduit body 1 and a conduit seat 4 connected thereto. The conduit seat 4 is provided on one side of the outer surface of the conduit body 1, and a tightening portion 5 is formed on the side of the conduit seat 4 near the conduit body 1 for fixing and tightening the conduit body 1. A fixing ring 8 is integrally connected to the center of the conduit seat 4, and one end of the conduit body 1 is fixed within the fixing ring 8 to ensure the stability of the conduit body 1.

[0028] like Figures 4-6As shown, an internal fixation tube 6 is fixed inside the catheter seat 4 near one end of the catheter body 1, and an annular limiting groove 7 is formed inside the internal fixation tube 6. Inside the catheter seat 4, a movable adjustment component 15 is provided, which includes a movable adjustment tube 16. One end of the movable adjustment tube 16 extends into the annular limiting groove 7 and slides along the annular limiting groove 7 to further limit the movable adjustment tube 16; the other end of the movable adjustment tube 16 is fixed with a connecting rod 18 in an annular array, and multiple connecting rods 18 pass through a fixing ring 8 and are fixed with a connecting ring 19, and the connecting rods 18 slide along the fixing ring 8. Arc-shaped slots 17 are opened at the upper and lower ends of the movable adjustment tube 16.

[0029] like Figure 4 and Figure 5 As shown, metal springs 30 are symmetrically arranged inside the conduit seat 4 along the upper and lower ends of the movable adjusting tube 16. Each metal spring 30 includes a compression deformation part 32, which passes through the arc-shaped slot 17 to compress the upper and lower ends of the conduit body 1, thereby further fixing and sealing the conduit body 1. The metal spring 30 also includes an arc-shaped fixing part 31 and a straight connecting part 33, these three parts being arranged sequentially and integrally formed. A fixing post 13 is fixed to the upper and lower ends near one side inside the conduit body 1, and the arc-shaped fixing part 31 is fixed to the outside of the fixing post 13 to fix the metal spring 30. Limiting posts 14 are also fixed inside the conduit body 1 along both sides of the arc-shaped slot 17. Two limiting posts 14 form a group and are attached to both sides of the compression deformation part 32 to limit the deformation range of the compression deformation part 32 while ensuring its compression effect on the conduit body 1. The straight connecting part 33 is fixed to the movable adjusting tube 16 by the fixing block 34, so that the movable adjusting tube 16 can drive the metal spring 30 to move together, and push the movable adjusting tube 16 to move together when the metal spring 30 is reset.

[0030] like Figure 4 , Figure 5 and Figure 7 As shown, drive adjustment components 23 are symmetrically arranged inside the catheter seat 4 along the upper and lower ends of the outer side of the fixing ring 8. Each drive adjustment component 23 includes a sliding column 24. Vertical limiting grooves 25 are formed inside the sliding column 24, and a vertical limiting rod 9 is fixed inside the catheter seat 4 at a position corresponding to the vertical limiting groove 25. The sliding column 24 slides along the vertical limiting rod 9, ensuring the stability of the drive adjustment component 23. An infusion needle squeezing plate 28 is fixed to the inner end of the sliding column 24. An inclined plate 29 is integrally connected to the side of the infusion needle squeezing plate 28 away from the catheter body 1. When the contrast agent infusion needle is inserted, it squeezes the inclined plate 29, thereby pushing the sliding column 24 to slide along the vertical limiting rod 9.

[0031] like Figure 6 and Figure 7As shown, connecting adjustment blocks 20 are symmetrically fixed at the upper and lower ends of the outer side of the connecting ring 19 for connection and adjustment with the drive adjustment component 23. The inner end face of the connecting adjustment block 20 forms a first inclined adjustment surface 21, which is in contact with the second inclined adjustment surface 27 in the inner slot 26 opened in the sliding column 24. When the sliding column 24 slides, it will drive the connecting adjustment block 20 to slide along the contact surface of the first inclined adjustment surface 21 and the second inclined adjustment surface 27, thereby pushing the connecting ring 19 and the moving adjustment tube 16 to move together. At the same time, the vertical limiting rod 9 slides along the through sliding groove 22 opened through the connecting adjustment block 20 to ensure the stability of the connecting adjustment block 20.

[0032] like Figure 1 and Figure 2 As shown, a soft tip 2 is fixed to the end of the catheter body 1 away from the catheter seat 4, and an elastic valve 3 is fixed to the outer surface of the soft tip 2. When the contrast agent infusion needle is inserted, it will open the elastic valve 3, allowing the contrast agent to smoothly enter the patient's body. After the contrast agent infusion is completed, the elastic valve 3 will automatically contract and close the inlet of the catheter body 1, reducing contrast agent backflow and infection.

[0033] like Figure 4 As shown, an annular support plate 10 is integrally connected to the end of the catheter hub 4 away from the catheter body 1, and a converging channel 11 is formed within the annular support plate 10. The opening diameter of the converging channel 11 gradually decreases towards the catheter body 1, and is used to guide and limit the contrast agent infusion needle. Annular anti-slip textures 12 are fixedly arranged on the inner surface of the catheter hub 4 along the outer side of the annular support plate 10 to increase the friction between the catheter hub 4 and the contrast agent infusion needle.

[0034] Working principle: The doctor disinfects the patient's vulva, vagina, and cervix and lays down sterile drapes. Under local anesthesia, the doctor inserts part 1 of the catheter body into the cervix through the vagina.

[0035] The contrast agent infusion needle injects contrast agent into the uterine cavity through the catheter. The needle travels along the converging channel 11 to between the two inclined plates 29. As the needle is pushed in, it compresses the infusion needle compression plate 28, causing it to move outwards. Due to the contact between the second inclined adjustment surface 27 within the sliding column 24 fixed at the outer end of the infusion needle compression plate 28 and the first inclined adjustment surface 21 on the connecting adjustment block 20, the connecting adjustment block 20 is pushed away from the catheter body 1. Through the connection between the straight connecting part 33 and the fixed block 34 with the moving adjustment tube 16, the metal spring 30 is partially moved away from the catheter body 1. Because the compression deformation part 32 is located within the arc-shaped slot 17, with the movement of the metal spring 30, the compression deformation part 32 deforms into a straight state under the action of the limiting column 14. The compression deformation part 32 no longer compresses the catheter body 1, and the contrast agent infusion needle passes normally through the catheter body 1 and the soft tip 2, pushing open the elastic valve 3.

[0036] When the contrast agent infusion needle is removed after the contrast agent infusion is completed, the elastic valve 3 contracts, sealing the inlet of the catheter body 1. After the contrast agent infusion needle is removed, the metal spring 30 resets, pulling the moving adjustment component 15 towards the catheter body 1, and the compression deformation part 32 resets and re-compresses the catheter body 1; due to the fit between the first inclined adjustment surface 21 of the connecting adjustment block 20 and the second inclined adjustment surface 27 inside the sliding column 24 fixed to the outer end of the infusion needle compression plate 28, the driving adjustment component 23 resets.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An anti-backflow conduit, comprising a conduit body (1), characterized in that: A catheter seat (4) is provided on one side of the outer side of the catheter body (1). A tightening part (5) is formed on the side of the catheter seat (4) close to the catheter body (1). A fixing ring (8) is integrally connected in the middle of the catheter seat (4). One end of the catheter body (1) is fixed in the fixing ring (8). A movable adjustment component (15) is provided inside the catheter seat (4). The movable adjustment component (15) includes a movable adjustment tube (16). The upper and lower ends of the movable adjustment tube (16) are provided with arc-shaped slots (17). Metal springs (30) are symmetrically arranged inside the catheter seat (4) along the upper and lower ends of the movable adjustment tube (16). The metal springs (30) include a compression deformation part (32). The compression deformation part (32) passes through the arc-shaped slot (17) and compresses the upper and lower ends of the catheter body (1).

2. The anti-backflow conduit according to claim 1, characterized in that: The metal spring (30) also includes an arc-shaped fixing part (31) and a straight connecting part (33). The arc-shaped fixing part (31), the extrusion deformation part (32) and the straight connecting part (33) are arranged in sequence and integrally formed. The upper and lower ends of the conduit body (1) are fixed with fixing posts (13) on the side close to the conduit body (1). The arc-shaped fixing part (31) is fixed to the outside of the fixing post (13). The conduit body (1) has limiting posts (14) fixed on both sides of the arc-shaped slot (17). The two limiting posts (14) are a group and fit against both sides of the extrusion deformation part (32). The straight connecting part (33) and the moving adjustment tube (16) are fixed by fixing block (34).

3. The anti-backflow conduit according to claim 1, characterized in that: The catheter seat (4) is symmetrically provided with drive adjustment components (23) at the upper and lower ends of the outer side of the fixing ring (8). The drive adjustment component (23) includes a sliding column (24). The sliding column (24) has vertical limiting grooves (25) opened at the upper and lower ends. The catheter seat (4) is fixed with a vertical limiting rod (9) at the position corresponding to the vertical limiting groove (25). The sliding column (24) slides along the vertical limiting rod (9). The inner end of the sliding column (24) is fixed with an infusion needle squeezing plate (28). The side of the infusion needle squeezing plate (28) away from the catheter body (1) is integrally connected with an inclined plate (29).

4. The anti-backflow conduit according to claim 3, characterized in that: An internal fixation tube (6) is fixed inside the catheter seat (4) near the catheter body (1). An annular limiting groove (7) is formed inside the internal fixation tube (6). One end of the movable adjustment tube (16) extends into the annular limiting groove (7) and slides along the annular limiting groove (7). The other end of the movable adjustment tube (16) is fixed with connecting rods (18) in an annular array. Multiple connecting rods (18) pass through the fixing ring (8) and are fixed with a connecting ring (19). The connecting rods (18) slide along the fixing ring (8). Connecting adjustment blocks (20) are symmetrically fixed at the upper and lower ends of the outer side of the connecting ring (19).

5. The anti-backflow conduit according to claim 4, characterized in that: The inner end face of the connecting adjustment block (20) forms a first inclined adjustment surface (21). The connecting adjustment block (20) has a through sliding groove (22) extending vertically. The vertical limiting rod (9) slides along the through sliding groove (22) on the connecting adjustment block (20). The sliding column (24) has an inner slot (26) at a position corresponding to the connecting adjustment block (20). The inner slot (26) and the contact surface of the first inclined adjustment surface (21) form a second inclined adjustment surface (27).

6. The anti-backflow conduit according to claim 1, characterized in that: The catheter body (1) is fixed with a soft tip (2) at one end away from the catheter seat (4), and an elastic valve (3) is fixed on the outer side of the soft tip (2).

7. The anti-backflow conduit according to claim 1, characterized in that: The catheter seat (4) is integrally connected to an annular support plate (10) at one end away from the catheter body (1). A converging channel (11) is formed inside the annular support plate (10). The opening diameter of the converging channel (11) gradually decreases towards the catheter body (1). Annular anti-slip patterns (12) are fixedly arranged on the inner surface of the catheter seat (4) along the outer side of the annular support plate (10).

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